Hey,

i wanna create a post (or Pre?) Fetch Hook in my Businesslogic.

Case:
I want to fetch a collection and add some stuff to each model, based on another collection. I wanna parse some variables to the fetching, to know what i have to search for inside the other collection.

Problem:
I can't add params to the fetch method, so that i can work with them iniside the hook. The Request-Body is always empty as every other place. 


How is this possible?

Best, Nico

Hi Nico,

Fetch method translates to a GET API call which doesn't accept request body parameters.

You can write a custom endpoint for this requirement. The flow can be something as below:

• Search on collection1.
• Based on parameters in request body, search on collection2.
  
• Merge the results and send the data back in response body.

Hey, thanks for that.

Jeah i have a custom endpoint before, but i wanna use the offline mechanics of Kinvey which does to only work correctly if i using the fetching method?

Best, Nico

Hi,

Which client side SDK are you using to interact with Kinvey?

Regards,

Wani

Backbone.js (inside titanium)



Best, Nico

Hey Wani,

that works! :)

Question:
What is the best way to structure the script inside the "pre" Fetch method? Until now my script was a custom Endpoint so it returns the events directly. 

Returning a response.body inside the pre fetch isn't usefull or? To me it seems to make more sense to insert my stuff into the postfetch?

Best, Nico

var logger = modules.logger.info;
	var async = modules.async;
	var body = response.body;
	var collectionAccess = modules.collectionAccess;
	var moment = modules.moment;
	var today = moment();
	
	
	
	var query = JSON.parse(request.params.query);
	
	
	
	
	// userID
	var userID = query.column2.$in[0];
	
	// squadID
	var squadID = query.column2.$in[1];
	
	
	delete query.column2;
  request.params.query = JSON.stringify(query);
	

	logger("userID: " + userID);
	logger("squadID: " + squadID);
	
	// Query to find Eventsl
	var q_events = {
	  'squad._id' : squadID
	};
	
	
	
	/**
	 * Self executed Function
	 */
	(function(){
	  
	  var _opts = {};
	  if(request.body.skip){
	    _opts['skip'] = request.body.skip
	  }
	  if(request.body.limit){
	    _opts['limit'] = request.body.limit
	  }
	  
	  
	  // Only Dates that are coming (today, or in the future)
	  if( request.body.future ){
	    q_events['date_start'] = { "$gt": today.unix() }
	  }
	   
	   // Sort Dates
	  _opts['sort'] = {'date_start' : 1};
	  
	  
	  // Find Events
	  collectionAccess.collection('events').find(q_events, _opts, function (err, docs){
	    if(err){
	      response.body = err;
	      response.complete(400);
	    }
	   // logger("Length: " + docs.length);
	    
	    // Query
	    var q_evtUser = {};
	    if(docs.length !== 0){
	      q_evtUser["$or"] = [];
  	    for( var doc in docs){
  	      q_evtUser['$or'].push({
            "event._id" : docs[doc]._id.toString()
          });
  	    }
  	    q_evtUser["user._id"] = userID;
	    }
	    
	    
	    
	    collectionAccess.collection('eventuser').find(q_evtUser, {},  function(err, _docs){
	      if(err){
	        logger(err);
	        response.body = q_evtUser;
	        response.complete(400);
	      }
	      
	      var newDocs = [];
	      for( var doc in docs){
	        docs[doc].status = 0;
	        for( var doc2 in _docs){
	          if(docs[doc]._id == _docs[doc2].event._id){
	            docs[doc].status = _docs[doc2].status;
	          }
	        }
	      }
	      
	      
	      
	      //logger(docs);
	      logger("Length: " + docs.length);
	      response.body = docs;
	      response.complete(200);
	    });
	    
	  }); // collection
	  
	  
	})();

 My Script at the moment.

Any Ideas regarding this? :)

Best, Nico

Okay, i guess i solved it. ;)


Inside my preFetch Hook i do my stuff and end the function with response.complete(200);

Inside my app i have to detect - before the query - if the app is online or offline. Cause when it's offline, i need to null the query. (Cause the "contains hack" not working offline, of course. )

Thinking about manipulate the model, so that i don't need to handle the query 2 ways, but that's in future.

best, Nico